New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

What device allows for the cleaning of the strainer in an oil system?

1. Shut-off valve

2. Main fuel valve

3. Back pressure relief valve

4. Return line

The correct answer is: Shut-off valve

The shut-off valve plays a crucial role in an oil system, particularly when it comes to the maintenance and cleaning of strainers. It serves as a means to isolate sections of the piping or equipment, enabling technicians to perform maintenance tasks without shutting down the entire system. When cleaning a strainer, the shut-off valve can be closed to stop the flow of oil, allowing safe access to the strainer itself. This isolation is essential for preventing spills and ensuring the work can be done safely and effectively. The main fuel valve, while vital for controlling the flow of fuel to the burner, does not directly facilitate the cleaning of strainers. Similarly, a back pressure relief valve is more focused on maintaining the appropriate pressure within the system rather than facilitating maintenance tasks. The return line is responsible for transporting oil back to the storage tank but does not provide a mechanism for isolating or cleaning the strainer. Thus, the shut-off valve is the correct answer because it specifically allows for safe and effective cleaning of the strainer within an oil system by stopping the flow of oil and isolating the section being serviced.